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powseries[tpsform] - truncated power series form of a formal series
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Calling Sequence
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tpsform(p, var, order)
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Parameters
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p
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name of a formal power series
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var
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variable to be used in the truncated series
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order
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(optional) number of terms to which resulting series should be accurate (this defaults to the global variable Order)
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Description
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The function tpsform(p, var, order) creates a truncated power series (a series data structure) in var. This truncated series is equal to p up to, but not including, the term containing x^order.
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In some cases tpsform can determine when the series is exact and so it drops the  term. Formal power series created using powpoly fall into this category.
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The command with(powseries,tpsform) allows the use of the abbreviated form of this command.
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